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Cortisporin Otic suspension is a combination of two antibiotics and an anti-inflammatory corticosteroid used to treat ear infections such as swimmer's ear, states RxList. Each milliliter contains 3.5 milligrams of neomycin base, 10,000 polymyxin B units and 10 milligrams of hydrocortisone. Inactive ingredients include cetyl alcohol, propylene glycol, polysorbate 80 and water. Sulfuric acid is sometimes added to adjust the pH balance. People who have certain medical conditions or allergies to the ingredients should not use this medication.